Pimproll Feeds

[Useless]

Originally Posted by Mr Spock

Using them in wordpress , using FeedWordpress.

Bear in mind, I haven't used FeedWordPress in a long, long time, but it used to take forever of FWP to complete it's mission each day when I'd invoke it. My theory was that it was not only looking for new posts, but overwriting already listed posts, no matter their publish date. I could be wrong.

[walrus]

I haven't used feedwordpress for a long time. I quit using it because it seems to do exactly as UW stated which not only causes the problem your having but also means that with some even less properly formatted feeds it will add duplicate posts.